<!DOCTYPE HTML>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Bootstrap 3 的多级下拉菜单示例</title>
    <script type="text/javascript" src="../js/jquery.1.9.1.min.js"></script>
    <link rel="stylesheet" href="../css/bootstrap.min.css"/>
    <script type="text/javascript" src="../js/bootstrap.min.js"></script>
    <style type="text/css">
        .dropdown-submenu {
            position: relative;
        }
        .dropdown-submenu > .dropdown-menu {
            top: 0;
            left: 100%;
            margin-top: -6px;
            margin-left: -1px;
            -webkit-border-radius: 0 6px 6px 6px;
            -moz-border-radius: 0 6px 6px;
            border-radius: 0 6px 6px 6px;
        }
        .dropdown-submenu:hover > .dropdown-menu {
            display: block;
        }
        .dropdown-submenu > a:after {
            display: block;
            content: " ";
            float: right;
            width: 0;
            height: 0;
            border-color: transparent;
            border-style: solid;
            border-width: 5px 0 5px 5px;
            border-left-color: #ccc;
            margin-top: 5px;
            margin-right: -10px;
        }
        .dropdown-submenu:hover > a:after {
            border-left-color: #fff;
        }
        .dropdown-submenu.pull-left {
            float: none;
        }
        .dropdown-submenu.pull-left > .dropdown-menu {
            left: -100%;
            margin-left: 10px;
            -webkit-border-radius: 6px 0 6px 6px;
            -moz-border-radius: 6px 0 6px 6px;
            border-radius: 6px 0 6px 6px;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="form-group">

            <input type="hidden" name="category_id" id="category_id" value="" />
            <div class="dropdown">
                <a id="dLabel" role="button" data-toggle="dropdown" class="btn btn-white" data-target="#" href="javascript:;"><span id="select-title">选择分类</span> <span class="caret"></span></a>
                <ul class="dropdown-menu multi-level" role="menu" aria-labelledby="dropdownMenu">
                    <li><a href="javascript:;" data-index="1" data-title="一级菜单">一级菜单</a></li>
                    <li class="dropdown-submenu">
                        <a href="javascript:;" data-index="2" data-title="一级菜单">一级菜单</a>
                        <ul class="dropdown-menu">
                            <li><a data-index="2-1" href="javascript:;" data-title="二级菜单">二级菜单</a></li>
                        </ul>
                    </li>

                    <li class="dropdown-submenu">
                        <a tabindex="3" href="javascript:;" data-title="一级菜单">一级菜单</a>
                        <ul class="dropdown-menu">
                            <li><a tabindex="3-1" href="javascript:;" data-title="二级菜单">二级菜单</a></li>
                            <li class="divider"></li>
                            <li class="dropdown-submenu">
                                <a href="javascript:;" data-index="3-2" data-title="二级菜单">二级菜单</a>
                                <ul class="dropdown-menu">
                                    <li><a href="javascript:;" data-index="3-2-1" data-title="三级菜单">三级菜单</a></li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                </ul>
            </div>

        </div>
    </div>
</div>
</body>
</html>

<script type="text/javascript">


    $('.dropdown li a').click(function(){

        console.log(this);
        title = $(this).attr("data-title");
        id = $(this).attr("data-index");
        $("#select-title").text(title);
        $("#category_id").val(id);
    })

</script>